forked from boostorg/fusion
Eric Niebler
5b6d08974e
https://svn.boost.org/svn/boost/trunk ........ r40862 | dave | 2007-11-06 15:39:09 -0800 (Tue, 06 Nov 2007) | 2 lines Added missing copyright/license ........ r40863 | djowel | 2007-11-06 18:12:28 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40864 | aaron_windsor | 2007-11-06 18:30:38 -0800 (Tue, 06 Nov 2007) | 1 line Shortening file name of a graph test to < 32 characters ........ r40865 | djowel | 2007-11-06 18:34:18 -0800 (Tue, 06 Nov 2007) | 1 line added license info in copyright notice at the footer ........ r40866 | djowel | 2007-11-06 19:06:23 -0800 (Tue, 06 Nov 2007) | 1 line added license info in copyright notice at the footer ........ r40867 | djowel | 2007-11-06 19:23:31 -0800 (Tue, 06 Nov 2007) | 1 line added license info in copyright notice at the footer ........ r40868 | djowel | 2007-11-06 19:25:59 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40869 | djowel | 2007-11-06 19:27:38 -0800 (Tue, 06 Nov 2007) | 1 line added license info in copyright notice at the footer ........ r40870 | djowel | 2007-11-06 19:30:01 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40871 | djowel | 2007-11-06 19:35:49 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40872 | djowel | 2007-11-06 19:37:51 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40873 | djowel | 2007-11-06 19:46:23 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40874 | chris_kohlhoff | 2007-11-06 22:49:36 -0800 (Tue, 06 Nov 2007) | 2 lines Add copyright notice. ........ r40875 | chris_kohlhoff | 2007-11-06 22:53:17 -0800 (Tue, 06 Nov 2007) | 2 lines Add myself as asio maintainer. ........ r40876 | chris_kohlhoff | 2007-11-06 23:23:53 -0800 (Tue, 06 Nov 2007) | 2 lines Add asio. ........ r40877 | joaquin | 2007-11-07 00:45:27 -0800 (Wed, 07 Nov 2007) | 1 line reapplied change at rev 40284 ........ r40878 | johnmaddock | 2007-11-07 02:07:08 -0800 (Wed, 07 Nov 2007) | 1 line Ooops, got the pp-logic wrong and disable long double support for all Unix platforms, instead of just Intel on Linux prior to version 10. ........ r40879 | johnmaddock | 2007-11-07 02:09:50 -0800 (Wed, 07 Nov 2007) | 1 line Fix calls to fpclassify so they don't trigger macro expansion when fpclassify is a macro. ........ r40880 | t_schwinger | 2007-11-07 02:14:42 -0800 (Wed, 07 Nov 2007) | 3 lines adds FunctionTypes ........ r40881 | johnmaddock | 2007-11-07 03:50:02 -0800 (Wed, 07 Nov 2007) | 1 line Change test (again) so that the range of values tested matches original test: last change started testing more extreme input values, which caused regressions on Mac OS X. ........ r40882 | johnmaddock | 2007-11-07 03:59:39 -0800 (Wed, 07 Nov 2007) | 3 lines Disabled use of long double when BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS is defined. Disabled special-double precision error rates when BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS is defined. ........ r40883 | johnmaddock | 2007-11-07 04:04:01 -0800 (Wed, 07 Nov 2007) | 1 line Oops get the name of test right! ........ r40884 | anthonyw | 2007-11-07 04:10:17 -0800 (Wed, 07 Nov 2007) | 1 line Added missing licence and copyright ........ r40885 | garcia | 2007-11-07 04:25:16 -0800 (Wed, 07 Nov 2007) | 2 lines added logging library. ........ r40886 | garcia | 2007-11-07 05:38:53 -0800 (Wed, 07 Nov 2007) | 2 lines Exception was accepted. ........ r40887 | fcacciola | 2007-11-07 06:12:15 -0800 (Wed, 07 Nov 2007) | 1 line Added explicit failures for newly discovered GCC const ref binding bug (see Ticket #1301) ........ [SVN r40891]
105 lines
9.2 KiB
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105 lines
9.2 KiB
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Tiers</title>
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<a accesskey="p" href="make_map.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="list_tie.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h5 class="title">
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<a name="fusion.container.generation.functions.tiers"></a><a href="tiers.html" title="Tiers">Tiers</a></h5></div></div></div>
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<p>
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Tiers are sequences, where all elements are non-const reference types.
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They are constructed with a call to a couple of <span class="emphasis"><em>tie</em></span>
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function templates. The succeeding sections document the various <span class="emphasis"><em>tier</em></span>
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flavors.
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</p>
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<div class="itemizedlist"><ul type="disc">
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<li><a href="list_tie.html" title="list_tie"><tt class="computeroutput"><span class="identifier">list_tie</span></tt></a></li>
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<li><a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a></li>
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<li><a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">map_tie</span></tt></a></li>
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</ul></div>
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<p>
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Example:
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</p>
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<pre class="programlisting">
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<span class="keyword">int</span> <span class="identifier">i</span><span class="special">;</span> <span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span> <span class="keyword">double</span> <span class="identifier">d</span><span class="special">;</span>
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<span class="special">...</span>
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<a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">c</span><span class="special">,</span> <span class="identifier">a</span><span class="special">);</span>
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</pre>
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<p>
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The <a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a> function creates
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a <a href="../../vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
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of type <tt class="computeroutput"><a href="../../vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">&,</span> <span class="keyword">char</span><span class="special">&,</span> <span class="keyword">double</span><span class="special">&></span></tt>. The same result could be achieved
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with the call <a href="make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a>(<a href="http://www.boost.org/doc/html/ref.html" target="_top"><tt class="computeroutput"><span class="identifier">ref</span></tt></a>(i), <a href="http://www.boost.org/doc/html/ref.html" target="_top"><tt class="computeroutput"><span class="identifier">ref</span></tt></a>(c), <a href="http://www.boost.org/doc/html/ref.html" target="_top"><tt class="computeroutput"><span class="identifier">ref</span></tt></a>(a))
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<sup>[<a name="id541758" href="#ftn.id541758">10</a>]</sup>
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.
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</p>
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<p>
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A <span class="emphasis"><em>tie</em></span> can be used to 'unpack' another tuple into
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variables. E.g.:
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</p>
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<pre class="programlisting">
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<span class="keyword">int</span> <span class="identifier">i</span><span class="special">;</span> <span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span> <span class="keyword">double</span> <span class="identifier">d</span><span class="special">;</span>
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<a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">c</span><span class="special">,</span> <span class="identifier">d</span><span class="special">)</span> <span class="special">=</span> <a href="make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="char">'a'</span><span class="special">,</span> <span class="number">5.5</span><span class="special">);</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">i</span> <span class="special"><<</span> <span class="string">" "</span> <span class="special"><<</span> <span class="identifier">c</span> <span class="special"><<</span> <span class="string">" "</span> <span class="special"><<</span> <span class="identifier">d</span><span class="special">;</span>
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</pre>
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<p>
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This code prints 1 a 5.5 to the standard output stream. A sequence unpacking
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operation like this is found for example in ML and Python. It is convenient
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when calling functions which return sequences.
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</p>
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<a name="fusion.container.generation.functions.tiers.ignore"></a><h6>
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<a name="id542064"></a>
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<a href="tiers.html#fusion.container.generation.functions.tiers.ignore">Ignore</a>
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</h6>
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<p>
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There is also an object called <span class="emphasis"><em>ignore</em></span> which allows
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you to ignore an element assigned by a sequence. The idea is that a function
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may return a sequence, only part of which you are interested in. For
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example:
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</p>
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<pre class="programlisting">
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<span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span>
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<a href="vector_tie.html" title="vector_tie"><tt class="computeroutput"><span class="identifier">vector_tie</span></tt></a><span class="special">(</span><span class="identifier">ignore</span><span class="special">,</span> <span class="identifier">c</span><span class="special">)</span> <span class="special">=</span> <a href="make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span>
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</pre>
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<div class="footnotes">
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<br><hr width="100" align="left">
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<div class="footnote"><p><sup>[<a name="ftn.id541758" href="#id541758">10</a>] </sup>
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see <a href="http://www.boost.org/doc/html/ref.html" target="_top">Boost.Ref</a>
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for details about <tt class="computeroutput"><span class="identifier">ref</span></tt>
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</p></div>
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</div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer"><small>Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p></small></div></td>
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